NDLI: Sensing of ozone based on its quenching effect on the photoluminescence of CdSe-based core-shell quantum dots

Content Provider	Springer Nature Link
Author	Ando, Masari Kamimura, Takuya Uegaki, Koichi Biju, Vasudevanpillai Shigeri, Yasushi
Copyright Year	2016
Abstract	Thin films of CdSe-based core-shell type quantum dots (CdSe/CdZnS, CdSe/ZnS and CdSeTe/ZnS) deposited on glass substrate were found to undergo a reversible change in photoluminescence (PL) on exposure to ozone in concentrations as low as 0.1 ppm in air. PL decreased rapidly on adding ozone and fully recovered after changing back to pure air. The PL of the CdSe/ZnS quantum dots (QDs) was not quenched by pure oxygen, nitrogen, argon, carbon dioxide, and air containing hydrogen. A comparison of various CdSe-based core-shell type QDs with different emission colors showed that green-emitting QDs with smaller size were more sensitive to ozone, while red-emitting QDs (of larger size) were more resistant to high concentrations of ozone. The response time of the sensor (for a 90 % signal change) was in the order of 10–20 min. The reversible, reproducible and selective response to ozone at room temperature under atmospheric pressure suggested that these QDs have a great potential in terms of fluorescent sensing of ozone. Graphical abstract Thin films of CdSe-based core-shell type QDs showed reversible change in photoluminescence (PL) by O3 in concentration as low as 0.1 ppm in air at room temperature. The PL is not affected by O2, N2, Ar, CO2, or H2
Starting Page	3019
Ending Page	3024
Page Count	6
File Format	PDF
ISSN	00263672
Journal	Microchimica Acta
Volume Number	183
Issue Number	11
e-ISSN	14365073
Language	English
Publisher	Springer Vienna
Publisher Date	2016-09-15
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Air analysis CdSe Core-shell nanoparticles Non-radiative recombination Quenching Sensor Nanochemistry Nanotechnology Characterization and Evaluation of Materials Analytical Chemistry Microengineering
Content Type	Text
Resource Type	Article
Subject	Analytical Chemistry

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